Abstract: The paper presents an explorative study of Open Source Software (OSS) focusing on the managerial decisions for acquisition of OSS. Based on three case studies we argue that whereas small organizations often may chose adoption of OSS expecting significant cost savings, a major barrier for larger organizations’ adoption of OSS lies in the organizations’ consolidation of the enterprise architectures, in addition to that OSS will not be adopted before satisfactory delivery and procurement models for OSS are established.
Keywords: Open Source Software, OSS, Enterprise Architecture, Total Cost of Ownership, Delivery and Procurement Model.